Charles adams and george macallan



(No Model.)

O. ADAMS & G. MAOALLAN.

BLAST PIPE FOR LOCOMOTIVES.

No. 453,321. Patented June 2, 1891.

UNITED STATES PATENT OFFICE.

CHARLES ADAMS AND GEORGE MACALLAN, OF LONDON, ENGLAND; SAID ADAMS ASSIGNOR TO SAID MAOALLAN.

BLAST-PIPE FOR LOCOMOTIVES.

SPECIFICATION forming part of Letters Patent No. 453,321, dated June 2, 1891.

Application filed March 6, 1891. Serial No. 384,022. (No model.) Tatented in England November 22,1888, No. 17,014.

To all whom it may concern:

Be it known that we, CHARLES ADAMs and GEORGE MAoALLAN, engineers, subjects of the Queen of Great Britain, residing, respectively, at 35 Queen Victoria Street and Earlham Grove, Forest Gate, London, England, have invented certain new and useful Improvements Relating to the Blast-Pipes of Locomotives and other High-Pressure Engines, (for which we have received Letters Patent in Great Britain, No. 17,014, dated November 22, 1888,) of which the following is aspecification.

On locomotives and other high-pressure engines the exhaust-steam from the cylinders passes through a blast-pipe at high velocity, exhausting air and gases from the smoke-box and causing draft through the tubes and furnace. The nozzle of an ordi-- nary blast-pipe is generally of such an area for each class of engine as will cause suflicientdraft to make steam to enable the engine to do its heaviest work. So far as we are aware no practical means has been provided for enlarging the area and so reducing the blast when required,although it has been proposed to provide the blast-pipe with removable wedge-shaped bushings for this purpose. We so arrange that the top of the blast-pipe consists of a short taper cap or nozzle attached to the lower portion by a hinged joint, which allows the cap to be moved out of the way when the steam passing through the blast-pipe causes more draft than required. The area of the outlet of the capis that of an ordinary suitable blast-pipe, and the area of the outlet of the lower part of the blast-pipe to which the cap is attached is considerably larger, so that when the exhaust-steam passes through that alone there is less draft, less consumption of fuel, less wear and tear of fire-box, tubes, 850., and less back-pressure. No sparks nor unconsumed particles of fuel can then be drawn into the smoke-box or thrown out of the chimney. The arrangement is such that the driver or fireman may at will from the foot-plate bring the ordinary or larger outlet into use.

Inorder that our said invention may be fully understood and readily carried into effect,we will proceed to describe the drawings hereunto annexed. I

a plan.

a is the fixed pipe.

I) is the movable conical cap or nozzle which we provide. lVe connect this cap or nozzle with the lower part of the blast-pipe by a hinge-joint.

a a are lugs on the pipe a, and Z2 is a lug on the cap.

0 is a joint-pin passing through the lugs.

It is free to turn in the lugs a, but is fast with the lug b.

d is an arm fixed on the joint-pin c. It is coupled to a longitudinal rod connected to any convenient arrangement of gear moved by hand from the foot-plate of the engine.

6 is a bush or liner partially inserted into and secured to the mouth of the pipe a. This effectually prevents steam from escaping at the joint between pipe (1 and cap or nozzle b when the said cap I) is on, as shown, and it also provides a convenient means of altering the area of the fixed outlet by substituting liners of various diameters, as represented by the dotted lines. In this way, when desired, the cap I) can be lifted from the top of the pipe a and moved out of the way, turning about the joint-pin 0. Again, when the engine-driver desires, the cap can be replaced on the top of the pipe.

What we claim is- 1. The combination of a blast-pipe, a movable cap, which when in place rests on the top of the .blast-pipe, and a liner inside both the cap and the mouth of the blast-pipe and covering the joint.

2. The combination of a blast-pipe, a movable cap hinged to the blast-pipe and which when in place rests on the top edge of the pipe, and a liner inside both the cap and the pipe and covering-the joint between them.

3. The combination of a blast-pipe, the lugs a thereon' the spindle c, mounted in bearings in the lugs, the annular cap provided with the arm I), connected to the spindle and arranged between the lugs a, and a liner e, inside both the cap and the pipe and covering the joint between them.

cIIARLEs ADAMS. GEORGE MAOALLAN.

Witnesses:

WILLIAM MATTHEWS, O. AUBREY (laws. 35 Queen Victoria Street, London, E. O. 

